fcs/lib/pages/rates/discount_by_weight_editor.dart

import 'package:fcs/domain/entities/discount_by_weight.dart';
import 'package:fcs/helpers/theme.dart';
import 'package:fcs/localization/app_translations.dart';
import 'package:fcs/pages/main/util.dart';
import 'package:fcs/pages/rates/model/shipment_rate_model.dart';
import 'package:fcs/pages/widgets/input_text.dart';
import 'package:fcs/pages/widgets/progress.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:provider/provider.dart';

class DiscountByWeightEditor extends StatefulWidget {
  final DiscountByWeight discountByWeight;
  DiscountByWeightEditor({this.discountByWeight});

  @override
  _DiscountByWeightEditorState createState() => _DiscountByWeightEditorState();
}

class _DiscountByWeightEditorState extends State<DiscountByWeightEditor> {
  TextEditingController _weightController = new TextEditingController();
  TextEditingController _discountController = new TextEditingController();

  bool _isLoading = false;
  bool _isNew;
  DiscountByWeight _discountByWeight = new DiscountByWeight();

  @override
  void initState() {
    super.initState();
    if (widget.discountByWeight != null) {
      _discountByWeight = widget.discountByWeight;
      _weightController.text = _discountByWeight.weight.toStringAsFixed(2);
      _discountController.text = _discountByWeight.discount.toString();
      _isNew = false;
    } else {
      _isNew = true;
    }
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final weightBox = InputText(
        labelTextKey: 'rate.discount.weight',
        iconData: FontAwesomeIcons.weightHanging,
        controller: _weightController);
    final discountRateBox = InputText(
        labelTextKey: 'rate.discount.rate',
        iconData: Icons.attach_money,
        controller: _discountController);

    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
        appBar: AppBar(
          centerTitle: true,
          leading: new IconButton(
            icon: new Icon(CupertinoIcons.back),
            onPressed: () {
              if (isDataChanged()) {
                showConfirmDialog(context, "back.button_confirm", () {
                  Navigator.of(context).pop();
                });
              } else {
                Navigator.of(context).pop();
              }
            },
          ),
          backgroundColor: primaryColor,
          title: Text(AppTranslations.of(context).text("discount.new")),
          actions: [
            IconButton(
              icon: Icon(Icons.delete),
              onPressed: _delete,
            )
          ],
        ),
        body: Container(
          padding: EdgeInsets.all(18),
          child: Column(
            children: <Widget>[
              Expanded(
                child: ListView(
                  children: <Widget>[
                    weightBox,
                    discountRateBox,
                    SizedBox(height: 30),
                  ],
                ),
              ),
              fcsButton(context, getLocalString(context, "btn.save"),
                  callack: _save),
              SizedBox(height: 10)
            ],
          ),
        ),
      ),
    );
  }

  _save() async {
    setState(() {
      _isLoading = true;
    });
    try {
      var shipmentRateModel =
          Provider.of<ShipmentRateModel>(context, listen: false);
      DiscountByWeight _discount = DiscountByWeight(
          weight: double.parse(_weightController.text),
          discount: double.parse(_discountController.text));
      if (_isNew) {
        await shipmentRateModel.addDiscountByWeight(_discount);
      } else {
        _discount.id = widget.discountByWeight.id;
        await shipmentRateModel.updateDiscountByWeight(_discount);
      }
      Navigator.pop(context);
    } catch (e) {
      showMsgDialog(context, "Error", e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  _delete() {
    showConfirmDialog(context, "rate.discount_by_weight.edit.delete.confirm",
        _deleteDiscountByWeight);
  }

  _deleteDiscountByWeight() async {
    setState(() {
      _isLoading = true;
    });
    try {
      var shipmentRateModel =
          Provider.of<ShipmentRateModel>(context, listen: false);
      await shipmentRateModel
          .deleteDiscountByWeight(widget.discountByWeight.id);
      Navigator.pop(context);
    } catch (e) {
      showMsgDialog(context, "Error", e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  isDataChanged() {
    if (_isNew) {
      return _weightController.text != "" || _discountController.text != "";
    } else {
      DiscountByWeight _discount = DiscountByWeight(
          weight: double.parse(_weightController.text),
          discount: double.parse(_discountController.text));
      return widget.discountByWeight.isChangedForEdit(_discount);
    }
  }
}